ElectronHe{sup +} Pwave elastic scattering and photoabsorption in twoelectron systems
Abstract
In a previous paper [A. K. Bhatia, Phys. Rev. A 69, 032714 (2004)], electronhydrogen Pwave scattering phase shifts were calculated using the optical potential approach based on the Feshbach projection operator formalism. This method is now extended to the singlet and triplet electronHe{sup +} Pwave scattering in the elastic region. Phase shifts are calculated using Hylleraastype correlation functions with up to 220 terms. Results are rigorous lower bounds to the exact phase shifts, and they are compared to phase shifts obtained from the method of polarized orbitals and closecoupling calculations. The continuum functions calculated here are used to calculate photoabsorption cross sections. Photoionization cross sections of He and photodetachment cross sections of H{sup } are calculated in the elastic regioni.e., leaving He{sup +} and H in their respective ground statesand compared with previous calculations. Radiative attachment rates are also calculated.
 Authors:
 NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771 (United States)
 Publication Date:
 OSTI Identifier:
 20786709
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevA.73.012705; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 74 ATOMIC AND MOLECULAR PHYSICS; CORRELATION FUNCTIONS; COUPLING; CROSS SECTIONS; ELASTIC SCATTERING; ELECTRON ATTACHMENT; ELECTRON DETACHMENT; ELECTRONATOM COLLISIONS; ELECTRONS; EXCITATION; GROUND STATES; HELIUM IONS; HYDROGEN; HYDROGEN IONS 1 MINUS; P WAVES; PHASE SHIFT; PHOTOIONIZATION; PHOTONATOM COLLISIONS; POTENTIALS; PROJECTION OPERATORS; TRIPLETS
Citation Formats
Bhatia, A. K. ElectronHe{sup +} Pwave elastic scattering and photoabsorption in twoelectron systems. United States: N. p., 2006.
Web. doi:10.1103/PHYSREVA.73.0.
Bhatia, A. K. ElectronHe{sup +} Pwave elastic scattering and photoabsorption in twoelectron systems. United States. doi:10.1103/PHYSREVA.73.0.
Bhatia, A. K. Sun .
"ElectronHe{sup +} Pwave elastic scattering and photoabsorption in twoelectron systems". United States.
doi:10.1103/PHYSREVA.73.0.
@article{osti_20786709,
title = {ElectronHe{sup +} Pwave elastic scattering and photoabsorption in twoelectron systems},
author = {Bhatia, A. K.},
abstractNote = {In a previous paper [A. K. Bhatia, Phys. Rev. A 69, 032714 (2004)], electronhydrogen Pwave scattering phase shifts were calculated using the optical potential approach based on the Feshbach projection operator formalism. This method is now extended to the singlet and triplet electronHe{sup +} Pwave scattering in the elastic region. Phase shifts are calculated using Hylleraastype correlation functions with up to 220 terms. Results are rigorous lower bounds to the exact phase shifts, and they are compared to phase shifts obtained from the method of polarized orbitals and closecoupling calculations. The continuum functions calculated here are used to calculate photoabsorption cross sections. Photoionization cross sections of He and photodetachment cross sections of H{sup } are calculated in the elastic regioni.e., leaving He{sup +} and H in their respective ground statesand compared with previous calculations. Radiative attachment rates are also calculated.},
doi = {10.1103/PHYSREVA.73.0},
journal = {Physical Review. A},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}

Elastic p{sup 3}He and n{sup 3}H scattering with two and threebody forces
We report on a microscopic calculation of n{sup 3}H and p{sup 3}He scattering employing the Argonne v{sub 18} and v{sub 8}' nucleonnucleon potentials with and without additional threenucleon force. An Rmatrix analysis of the p{sup 3}He and n{sup 3}H scattering data is presented. Comparisons are made for the phase shifts and a selection of measurements in both scattering systems. Differences between our calculation and the Rmatrix results or the experimental data can be attributed to only two partial waves ({sup 3}P{sub 0} and {sup 3}P{sub 2}). We find the effect of the Urbana IX and the TexasLos Alamos threenucleon forcesmore » 
Opticalmodel partialwave analyses of p/sup 4/He elastic scattering
We have performed opticalmodel calculations using the KleinGordon and the Dirac equations for the 600 MeV p/sup 4/He scattering experiments of Boschitz et al., and the 1050 MeV p/sup 4/He scattering experiments of Baker et al. We have compared these analyses with our previous analysis of the 1000 MeV p/sup 4/He experiment of Palevsky et al. In comparing the results at the three energies we find that the experiments require a slightly energydependent optical potential rms radius. The average value is in good agreement with the /sup 4/He matter radius obtained from electron scattering, and substantially smaller than the lowmore » 
Photoabsorption cross sections of twoelectron atoms by the coordinate rotation method: Application to H$sup $ and several states of He
The coordinate rotation method, recently extended by us to treat photoabsorption processes, is used to obtain photoabsorption cross sections for several twoelectron atoms. The calculations are performed using standard configurationinteraction methods; the need for atomic continuum wavefunctions is completely avoided in this approach. We have computed the photodetachment cross section of H$sup $ and photoionization cross sections for He in its ground and 2 $sup 1$S states. In all cases, the computed cross sections agree well with results obtained by numerical integration and with available experimental data. (AIP)